Adjustable dumbbell holder stand



FIG. 1 is a perspective view of the adjustable dumbbell holder stand holding a dumbbell;

FIG. 2 is a perspective view of the adjustable dumbbell holder stand;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a front elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken line showing the dumbbell in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an adjustable dumbbell holder stand, as shown and described. 